Андреевская спектроскопия железосодержащих сверхпроводников: температурная зависимость параметров порядка и их скейлинг с Тc

Успехи физических наук. 2014. Т. 184. № 8. С. 888–897.

Кузьмичева Т. Е., Кузьмичев С. А., Михеев М. Г., Пономарев Я. Г., Чесноков С. Н., Пудалов В.М., Хлыбов Е. П., Жигадло Н. Д.

The unexpected discovery in 2006 of the first layered Fe-based high-temperature superconductor (HTSC), LnOFePn
(where Ln is lanthanide, Pn is pnictide; hereafter referred to as 1111), becomes a key issue in modern solid-state physics. Since 2008, the class of iron-based superconductors has greatly expanded: several families of iron pnictides and chalcogen-
ides have been synthesized. The crystal structure of oxypnictides is reminiscent of that of cuprates and is, in fact,
a stack of superconducting Fe±As layers alternating along the c-direction with spacers, nonsuperconducting oxide blocks,
LnO. In spite of the pronounced layered structure and  anisotropic physical properties, the electron subsystem in Fe-
based superconductors is less quasi-two-dimensional than that in cuprate HTSC, because the height of the Fe-As blocks
exceeds the thickness of the CuO2 planes, whereas the distance between superconducting blocks in iron-based superconductors is significantly shorter than that in cuprates. This seems to be a reason why the critical temperature of Fe-based superconductors, though being as high as Tc=57K, still does not reach the cuprate one.

Keywords: high temperature superconductors, iron pnictides, высокотемпературные сверхпроводники, пниктиды железа